Verses with the word bithynia in the New Testament (2 verses):

Acts 16:7
After they were come to Mysia, they assayed to go into Bithynia: but the Spirit suffered them not.

1 Peter 1:1
Peter, an apostle of Jesus Christ, to the strangers scattered throughout Pontus, Galatia, Cappadocia, Asia, and Bithynia,